Edited end CS script part

  local fTime = 0
  local fTempTimer = 0
  while true do
    for i=1, #Rocks do
      local Rock = Rocks[i]
      local vRock = Rock:GetPlacement():GetVect()
      local vDistance = vRock-vMarker
      local fSwapDistance = 10
      if mthRndF()<0.2 then
        --local fFrontVelocity = Rock:GetFrontVelocity()
        --Rock:SetFrontVelocity(-fFrontVelocity)
        Rock:SetRotationalVelocity(mthVector3f(Rnd(10), Rnd(10), Rnd(10)))
        local fFrontVelocity = Rnd(0.1)
        Rock:SetFrontVelocity(fFrontVelocity)
      end
      if (mthAbsF(vDistance.x)>fSwapDistance or
          mthAbsF(vDistance.y)>fSwapDistance or
          mthAbsF(vDistance.z)>fSwapDistance) then
         local fFrontVelocity = Rock:GetFrontVelocity()
          Rock:SetFrontVelocity(-fFrontVelocity)
      end
      while (fTempTimer < 0.1) do
        fTempTimer=fTempTimer+Wait(CustomEvent("OnStep")):GetTimeStep()
      end
      fTempTimer=fTempTimer-0.1
      fTime=fTime+0.1
      if fTime>=32 and fTime<32.1 then
        worldInfo:StartTextScroll(ptrScrollText, 150);
      end
      if fTime>=152 and fTime<152.1 then
        Letter_01:Appear()
        Letter_01_Particle:Start()
        Letter_01_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_02:Appear()
        Letter_02_Particle:Start()
        Letter_02_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_03:Appear()
        Letter_03_Particle:Start()
        Letter_03_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_04:Appear()
        Letter_04_Particle:Start()
        Letter_04_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_05:Appear()
        Letter_05_Particle:Start()
        Letter_05_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_06:Appear()
        Letter_06_Particle:Start()
        Letter_06_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_07:Appear()
        Letter_07_Particle:Start()
        Letter_07_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_08:Appear()
        Letter_08_Particle:Start()
        Letter_08_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_09:Appear()
        Letter_09_Particle:Start()
        Letter_09_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_10:Appear()
        Letter_10_Particle:Start()
        Letter_10_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_11:Appear()
        Letter_11_Particle:Start()
        Letter_11_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_12:Appear()
        Letter_12_Particle:Start()
        Letter_12_Sound:PlayOnce()
        Wait(Delay(0.2))
        Letter_13:Appear()
        Letter_13_Particle:Start()
        Letter_13_Sound:PlayOnce()
      end
      if fTime>=168 then
        SignalEvent("End game")
      end
    end
  end